test: regression test for order by in clause subquery

Author: tobyhede

packages/cipherstash-proxy-integration/src/select/mod.rs

@@ -2,4 +2,5 @@ mod group_by;
 mod order_by;
 mod order_by_with_null;
 mod pg_catalog;
+mod regression;
 mod unmappable;

packages/cipherstash-proxy-integration/src/select/regression.rs

@@ -0,0 +1,25 @@
+#[cfg(test)]
+mod tests {
+    use crate::common::{insert, query_by, random_id, trace};
+
+    ///
+    /// IN clause subquery should be able to use ORDER BY
+    ///
+    #[tokio::test]
+    async fn select_with_order_by_in_subquery() {
+        trace();
+
+        let id = random_id();
+        let encrypted_text = "hello".to_string();
+
+        let sql = "INSERT INTO encrypted (id, encrypted_text) VALUES ($1, $2)";
+        insert(sql, &[&id, &encrypted_text]).await;
+
+        let sql = "SELECT encrypted_text FROM encrypted WHERE id IN (SELECT id FROM encrypted WHERE id = $1 ORDER BY id DESC LIMIT 10 OFFSET 0) GROUP BY encrypted_text";
+
+        let result = query_by::<String>(sql, &id).await;
+
+        let expected = vec![encrypted_text];
+        assert_eq!(expected, result);
+    }
+}